酸性气藏泡沫排水复合缓蚀起泡剂研究

Research of corrosion inhibition and foaming compound agent for acidic gas reservoir

酸性气藏在酸性气体及地层水的共同作用下，对油套管有较大的腐蚀。在对酸性气藏进行泡排时，需要使用缓蚀剂进行腐蚀防护，而起泡剂和缓蚀剂之间存在配伍性的问题。针对川渝酸性气藏气水质特点，通过优选适用于矿化度为0~293 g/L 的起泡组分、配伍的水溶性缓蚀组分以及起泡组分和缓蚀组分的复配和性能评价，研制出复合缓蚀起泡剂 CT5-7F。该剂在矿化度为0~293 g/L 的地层水中、质量浓度为1.5 g/L 时，起泡能力大于185 mm、3 min 泡高大于165 mm、15 min 携液量大于152 mL、腐蚀速率低于0.076 mm/a、缓蚀率大于80%，可用于酸性气藏的泡排和防腐。

Corrosion rates of tubing and casing could be excessive in acidic gas reservoir for the in-teraction of the acid gas and formation water.Therefore,wells being treated with foaming agent should also be treated with an appropriate corrosion inhibitor simultaneously.However,mixing cor-rosion inhibitor and foaming agent would lead to chemical incompatibility.Based on the characteristics of acidic gas reservoir in Sichuan and Chongqing,through the optimization of foaming agent applying to salinity range of 0 ~ 293 g/L and water soluble corrosion inhibitor,with the distribution and per-formance evaluation of them,CT5-7F has been developed.This compound agent could be used in the formation water with salinity from 0 to 293 g/L,When the dosage is 1.5 g/L,producing foam ability is more than 185 mm,foam stability is more than 1 65 mm,liquid-carrying volume is more than 152 mL/15 min,corrosion rate is lower than 0.076 mm/a and inhibition rate is more than 80%,can be used in acidic nature gas field.